Company: Laser sparks revolution in internal combustion engines

April 20, 2011

WASHINGTON, April 20 — For more than 150 years, spark plugs have powered internal combustion engines. Automakers are now one step closer to being able to replace this long-standing technology with laser igniters, which will enable cleaner, more efficient, and more economical vehicles.

In the past, lasers strong enough to ignite an engine’s air-fuel mixtures were too large to fit under an automobile’s hood. At this year’s Conference on Lasers and Electro Optics (CLEO: 2011), to be held in Baltimore May 1 – 6, researchers from Japan will describe the first multibeam laser system small enough to screw into an engine’s cylinder head.

Equally significant, the new laser system is made from ceramics, and could be produced inexpensively in large volumes, according to one of the presentation’s authors, Takunori Taira of Japan’s National Institutes of Natural Sciences.

According to Taira, conventional spark plugs pose a barrier to improving fuel economy and reducing emissions of nitrogen oxides (NOx), a key component of smog.

Spark plugs work by sending small, high-voltage electrical sparks across a gap between two metal electrodes. The spark ignites the air-fuel mixture in the engine’s cylinder — producing a controlled explosion that forces the piston down to the bottom of the cylinder, generating the horsepower needed to move the vehicle.

Engines make NOx as a byproduct of combustion. If engines ran leaner — burnt more air and less fuel — they would produce significantly smaller NOx emissions.

Spark plugs can ignite leaner fuel mixtures, but only by increasing spark energy. Unfortunately, these high voltages erode spark plug electrodes so fast, the solution is not economical. By contrast, lasers, which ignite the air-fuel mixture with concentrated optical energy, have no electrodes and are not affected.

Lasers also improve efficiency. Conventional spark plugs sit on top of the cylinder and only ignite the air-fuel mixture close to them. The relatively cold metal of nearby electrodes and cylinder walls absorbs heat from the explosion, quenching the flame front just as it starts to expand.

Lasers, Taira explains, can focus their beams directly into the center of the mixture. Without quenching, the flame front expands more symmetrically and up to three times faster than those produced by spark plugs.

Equally important, he says, lasers inject their energy within nanoseconds, compared with milliseconds for spark plugs. “Timing — quick combustion — is very important. The more precise the timing, the more efficient the combustion and the better the fuel economy,” he says.

Lasers promise less pollution and greater fuel efficiency, but making small, powerful lasers has, until now, proven hard. To ignite combustion, a laser must focus light to approximately 100 gigawatts per square centimeter with short pulses of more than 10 millijoules each.

“In the past, lasers that could meet those requirements were limited to basic research because they were big, inefficient, and unstable,” Taira says. Nor could they be located away from the engine, because their powerful beams would destroy any optical fibers that delivered light to the cylinders.

Taira’s research team overcame this problem by making composite lasers from ceramic powders. The team heats the powders to fuse them into optically transparent solids and embeds metal ions in them to tune their properties.

Ceramics are easier to tune optically than conventional crystals. They are also much stronger, more durable, and thermally conductive, so they can dissipate the heat from an engine without breaking down.

Taira’s team built its laser from two yttrium-aluminum-gallium (YAG) segments, one doped with neodymium, the other with chromium. They bonded the two sections together to form a powerful laser only 9 millimeters in diameter and 11 millimeters long (a bit less than half an inch).

The composite generates two laser beams that can ignite fuel in two separate locations at the same time. This would produce a flame wall that grows faster and more uniformly than one lit by a single laser.

The laser is not strong enough to light the leanest fuel mixtures with a single pulse. By using several 800-picosecond-long pulses, however, they can inject enough energy to ignite the mixture completely.

A commercial automotive engine will require 60 Hz (or pulse trains per second), Taira says. He has already tested the new dual-beam laser at 100 Hz. The team is also at work on a three-beam laser that will enable even faster and more uniform combustion.

The laser-ignition system, although highly promising, is not yet being installed into actual automobiles made in a factory. Taira’s team is, however, working with a large spark-plug company and with DENSO Corporation, a member of the Toyota Group.

This work is supported by the Japan Science and Technical Agency (JST).

With a distinguished history as the industry’s leading event on laser science, the Conference on Lasers and Electro-Optics (CLEO) and the Quantum Electronics Laser Science Conference (QELS) is where laser technology was first introduced. CLEO: 2011 will unite the field of lasers and electro-optics by bringing together all aspects of laser technology, with content stemming from basic research to industry application. Sponsored by the American Physical Society’s (APS) Laser Science Division, the Institute of Electronic Engineers (IEEE) Photonics Society and the Optical Society (OSA), CLEO: 2011 provides the full range of critical developments in the field, showcasing the most significant milestones from laboratory to marketplace. With an unparalleled breadth and depth of coverage, CLEO: 2011 connects all of the critical vertical markets in lasers and electro-optics. For more information, visit the conference’s website at www.cleoconference.org.

26 COMMENTS

Love it I hope you keep it and make it work selling them to installers and the masses. I hope you keep me in mind if you need an installer in just north of Philadelphia bucks County. Sams auto Service warminster pa, 18974

The FireStorm Plasma iPlug is a new entry in the formerly mundane area of Spark Plugs. All Spark Plugs produce “sparks” to ignite the Air Fuel Mixture in the combustion Chambers. FireStorm is different, it produces “PLASMA”. By doing that, it eliminates the Catalytic Converter and EGR Systems and can still pass future emission requirements in California.

Further testing after that clip was shot in Detroit proved a 70% savings in fuel all while affording a 125 More Horsepower.
It is a Paradigm Shift in Air Fuel Ratio as this plug operates at 30 to 1 Air to Fuel Ratio. All current IC engines operate at 14.7 to 1 and require a Cat and EGR.

FireStorm can even crack water right in the Combustion_Chamber thereby eliminating so-called HHO Generators. Can I hear fill your car up at the side of your house with the garden hose? YES!!!!
SB3U

The FireStorm Plasma iPlug is a new entry in the formerly mundane area of Spark Plugs. All Spark Plugs produce “sparks” to ignite the Air Fuel Mixture in the combustion Chambers. FireStorm is different, it produces “PLASMA”. By doing that, it eliminates the Catalytic Converter and EGR Systems and can still pass future emission requirements in California.

Further testing after that clip was shot in Detroit proved a 70% savings in fuel all while affording a 125 More Horsepower.
It is a Paradigm Shift in Air Fuel Ratio as this plug operates at 30 to 1 Air to Fuel Ratio. All current IC engines operate at 14.7 to 1 and require a Cat and EGR.

FireStorm can even crack water right in the Combustion_Chamber thereby eliminating so-called HHO Generators. Can I hear fill your car up at the side of your house with the garden hose? YES!!!!
SB3U

The FireStorm Plasma iPlug is a new entry in the formerly mundane area of Spark Plugs. All Spark Plugs produce “sparks” to ignite the Air Fuel Mixture in the combustion Chambers. FireStorm is different, it produces “PLASMA”. By doing that, it eliminates the Catalytic Converter and EGR Systems and can still pass future emission requirements in California.

Further testing after that clip was shot in Detroit proved a 70% savings in fuel all while affording a 125 More Horsepower.
It is a Paradigm Shift in Air Fuel Ratio as this plug operates at 30 to 1 Air to Fuel Ratio. All current IC engines operate at 14.7 to 1 and require a Cat and EGR.

FireStorm can even crack water right in the Combustion_Chamber thereby eliminating so-called HHO Generators. Can I hear fill your car up at the side of your house with the garden hose? YES!!!!
SB3U

I am all for this but think retro fit wont work as well …. have to have much better timing for the fire!
right now for TDC there is slop in the timing that would prevent the exact fire needed for this to work correctly ….
Here is some food for thought though …. what about change the air come in for a better burn?
Ever wonder how them oxygen consecrates work so that they do not have to have tanks of oxygen but get 97 to 99% oxygen?
they drag the air through a rock!
so what if we changed the air to 90% or better oxygen then ignited it would make a much better burn and way less fuel to do it!!!

Excuse my ignorance, but it seems to me that a true breakthrough will come when these very efficient plugs can be easily retrofitted into existing engines. Is this possible with the devices you review here, or would it be with an under-the-hood adapter?

No matter how dramatic the improvement, not too many people will buy a new car with an unproven technology on the basis of a promise of an additional 5mpg, (or even 10mpg). A retrofit would sell and be accepted much quicker, and have an impact that much faster.

Electric vehicles are not carbon neutral, which is a crock anyway. They still rely on the electrical grid and power plants. Unless you are getting the power from a nuke plant you are still burning hydrocarbons or coal. Wind and solar power just will never replace other power sources without major improvements in technologies.

I am glad to see an advancement in spark plug technology. Seen many claims for improved plugs over the years, but most are snake oil. Hopefully these new laser plugs will be on the market in the near future.

Why we do not have a magnetic engine by now is totally ridiculous , the entire univers runs off of magnetics, yet we can not build the elusive free maganet motor , I believe we have one the greedy oil companies have bought it and thrown it in a closet and the people will never see it . Isnt capitalism wonderful